Quick Start Guide for Embedded Platforms

NVIDIA Riva Speech AI Skills supports two architectures, Linux x86_64 and Linux ARM64. These are referred to as data center (x86_64) and embedded (ARM64). These instructions are applicable to embedded users.

For more information and questions, visit the NVIDIA Riva Developer Forum.

:::{note} Riva embedded (ARM64) is in public beta. :::

Prerequisites

Before using Riva Speech AI, ensure you meet the following prerequisites:

1. You have access and are logged into NVIDIA NGC. For step-by-step instructions, refer to the NGC Getting Started Guide.

2. You have access to an NVIDIA Jetson Orin, NVIDIA Jetson AGX Xavier, or NVIDIA Jetson NX Xavier. For more information, refer to the Support Matrix.

3. You have installed NVIDIA JetPack version 5.0.2 on the Jetson platform. For more information, refer to the Support Matrix.

4. You have ~15 GB free disk space on Jetson as required by the default containers and models. If you are deploying your custom Riva model intermediate representation (RMIR) models, the additional disk space required is ~16 GB plus the size of custom RMIR models.

5. You have enabled the following power modes on the Jetson platform. These modes activate all CPU cores and clock the CPU/GPU at maximum frequency for achieving best performance.

   sudo nvpmodel -m 0 (Jetson Orin AGX, mode MAXN)
   sudo nvpmodel -m 0 (Jetson Xavier AGX, mode MAXN)
   sudo nvpmodel -m 2 (Jetson Xavier NX, mode MODE_15W_6CORE)
   

6. You have set the default runtime to nvidia on the Jetson platform by adding the following line in the /etc/docker/daemon.json file. Restart the Docker service using sudo systemctl restart docker after editing the file.

   "default-runtime": "nvidia"
   

Getting Started with Riva for Embedded Platforms

Riva includes Quick Start scripts to help you get started with Riva Speech AI Skills. These scripts are meant for deploying the services locally, for testing, and running the example applications.

1. Download the Riva Quick Start scripts. You can either use the command-line interface or you can download the scripts directly from your browser. Click the Download drop-down button in the upper right corner and select:

   • CLI - the download command is copied. Ensure you have the NGC CLI tool installed. Once installed, open the command prompt and paste the copied command to start your download.

   • Broswer (Direct Download) - the download begins in a location of your choosing.

2. Initialize and start Riva. The initialization step downloads and prepares Docker images and models. The start script launches the server.

   :::{note} This process can take up to an hour on an average internet connection. On embedded platforms, preoptimized models for the GPU on the NVIDIA Jetson are downloaded. :::

   Optional: Modify the config.sh file within the quickstart directory with your preferred configuration. Options include:

   • which models to retrieve from NGC
   • where to store them
   • which GPU to use if more than one is installed on your system (refer to Local (Docker) for more details)
   • locations of the SSL/TLS certificate
   • key files if using a secure connection

   cd riva_quickstart_arm64_v2.8.1
   

   :::{note} If you are using the Jetson AGX Xavier or the Jetson NX Xavier platform, set the $riva_tegra_platform variable to xavier in the config.sh file within the quickstart directory. :::

   To use a USB device for audio input/output, connect it to the Jetson platform so it gets auto mounted into the container.

   Initialize and start Riva

   bash riva_init.sh
   bash riva_start.sh
   

3. Try walking through the different tutorials on GitHub. If running the Riva Quick Start scripts on a cloud service provider (such as AWS or GCP), ensure that your compute instance has an externally visible IP address. To run the tutorials, connect a browser window to the correct port (8888 by default) of that external IP address.

4. Shut down the server when finished. After you have completed these steps and experimented with inferencing, run the riva_stop.sh script to stop the server.

For further details on how to customize a local deployment, refer to the Local (Docker) section.

Transcribe Audio Files with Riva

For Automatic Speech Recognition (ASR), run the following commands from inside the Riva server container to perform streaming and offline transcription of audio files. If using SSL/TLS, ensure to include the --ssl_server_cert /ssl/server.crt option.

1. For offline recognition, run:

   riva_asr_client --audio_file=/opt/riva/wav/en-US_sample.wav
   

2. For streaming recognition, run:

   riva_streaming_asr_client --audio_file=/opt/riva/wav/en-US_sample.wav
   

Synthesize Speech with Riva

From within the Riva server container, run the following command to synthesize the audio files.

riva_tts_client --voice_name=English-US.Female-1 \
                --text="Hello, this is a speech synthesizer." \
                --audio_file=/opt/riva/wav/output.wav

The audio files are stored in the /opt/riva/wav directory.

The streaming API can be tested by using the command-line option --online=true. However, there is no difference between both options with the command-line client since it saves the entire audio to a .wav file.

Riva Collections

The Riva Collection contains the Riva Speech AI server, the Riva Speech AI client containers, the Riva Quick Start scripts resources, and the Riva Speech AI Skills Helm chart.

Suggested Reading

For the latest product documentation, supported hardware and software, and release notes, refer to the Riva User's Guide.

Additional Resources

For organizations looking to deploy Riva-based applications in production to unlimited workloads and get full NVIDIA support with direct access to NVIDIA AI experts globally, explore NVIDIA Riva or try NVIDIA Riva for free on NVIDIA LaunchPad.

License

By downloading and using Riva software, you accept the terms and conditions of this license.